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This commit is contained in:
skarg
2007-11-29 15:56:53 +00:00
parent c585241c03
commit 411d6c1b24
236 changed files with 17864 additions and 15724 deletions
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bacnet-stack/ports/at91sam7s/rs485.c
+50 -45
View File
@@ -62,52 +62,51 @@ static int RS485_Baud = 38400;
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
void RS485_Initialize(void)
void RS485_Initialize(
void)
{
/* Enable the USART0 clock in the Power Management Controller */
volatile AT91PS_PMC pPMC = AT91C_BASE_PMC;
pPMC->PMC_PCER = pPMC->PMC_PCSR | (1<<AT91C_ID_US0);
pPMC->PMC_PCER = pPMC->PMC_PCSR | (1 << AT91C_ID_US0);
/* Disable and clear USART0 interrupt
in AIC Interrupt Disable Command Register */
volatile AT91PS_AIC pAIC = AT91C_BASE_AIC;
pAIC->AIC_IDCR = (1<<AT91C_ID_US0);
pAIC->AIC_ICCR = (1<<AT91C_ID_US0);
pAIC->AIC_IDCR = (1 << AT91C_ID_US0);
pAIC->AIC_ICCR = (1 << AT91C_ID_US0);
/* enable the peripheral by disabling the pin in the PIO controller */
*AT91C_PIOA_PDR = AT91C_PA5_RXD0 | AT91C_PA6_TXD0 | AT91C_PA7_RTS0;
RS485_Interface->US_CR =
AT91C_US_RSTRX | /* Reset Receiver */
AT91C_US_RSTTX | /* Reset Transmitter */
AT91C_US_RSTSTA | /* Clear status register */
AT91C_US_RXDIS | /* Receiver Disable */
AT91C_US_TXDIS; /* Transmitter Disable */
RS485_Interface->US_CR = AT91C_US_RSTRX | /* Reset Receiver */
AT91C_US_RSTTX | /* Reset Transmitter */
AT91C_US_RSTSTA | /* Clear status register */
AT91C_US_RXDIS | /* Receiver Disable */
AT91C_US_TXDIS; /* Transmitter Disable */
RS485_Interface->US_MR =
AT91C_US_USMODE_RS485 | /* RS-485 Mode - RTS auto assert */
AT91C_US_CLKS_CLOCK | /* Clock = MCK */
AT91C_US_CHRL_8_BITS | /* 8-bit Data */
AT91C_US_PAR_NONE | /* No Parity */
AT91C_US_NBSTOP_1_BIT; /* 1 Stop Bit */
RS485_Interface->US_MR = AT91C_US_USMODE_RS485 | /* RS-485 Mode - RTS auto assert */
AT91C_US_CLKS_CLOCK | /* Clock = MCK */
AT91C_US_CHRL_8_BITS | /* 8-bit Data */
AT91C_US_PAR_NONE | /* No Parity */
AT91C_US_NBSTOP_1_BIT; /* 1 Stop Bit */
/* set the Time Guard to release RTS after x bit times */
RS485_Interface->US_TTGR = 1;
/* Receiver Time-out disabled */
RS485_Interface->US_RTOR = 0;
/* baud rate */
RS485_Interface->US_BRGR = MCK/16/RS485_Baud;
RS485_Interface->US_BRGR = MCK / 16 / RS485_Baud;
RS485_Interface->US_CR = AT91C_US_RXEN | /* Receiver Enable */
AT91C_US_TXEN; /* Transmitter Enable */
RS485_Interface->US_CR =
AT91C_US_RXEN | /* Receiver Enable */
AT91C_US_TXEN; /* Transmitter Enable */
return;
}
void RS485_Cleanup(void)
void RS485_Cleanup(
void)
{
}
@@ -118,7 +117,8 @@ void RS485_Cleanup(void)
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
uint32_t RS485_Get_Baud_Rate(void)
uint32_t RS485_Get_Baud_Rate(
void)
{
return RS485_Baud;
}
@@ -129,7 +129,8 @@ uint32_t RS485_Get_Baud_Rate(void)
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
bool RS485_Set_Baud_Rate(uint32_t baud)
bool RS485_Set_Baud_Rate(
uint32_t baud)
{
bool valid = true;
@@ -141,7 +142,7 @@ bool RS485_Set_Baud_Rate(uint32_t baud)
case 76800:
case 115200:
RS485_Baud = baud;
RS485_Interface->US_BRGR = MCK/16/baud;
RS485_Interface->US_BRGR = MCK / 16 / baud;
/* FIXME: store the baud rate */
break;
default:
@@ -158,14 +159,15 @@ bool RS485_Set_Baud_Rate(uint32_t baud)
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
void RS485_Turnaround_Delay(void)
void RS485_Turnaround_Delay(
void)
{
uint16_t turnaround_time;
/* delay after reception before trasmitting - per MS/TP spec */
/* wait a minimum 40 bit times since reception */
/* at least 1 ms for errors: rounding, clock tick */
turnaround_time = 1 + ((Tturnaround*1000UL)/RS485_Baud);
turnaround_time = 1 + ((Tturnaround * 1000UL) / RS485_Baud);
while (Timer_Silence() < turnaround_time) {
/* do nothing - wait for timer to increment */
};
@@ -177,9 +179,10 @@ void RS485_Turnaround_Delay(void)
* ALGORITHM: none
* NOTES: The Atmel ARM7 has an automatic enable/disable in RS485 mode.
*****************************************************************************/
void RS485_Transmitter_Enable(bool enable)
void RS485_Transmitter_Enable(
bool enable)
{
(void)enable;
(void) enable;
}
/****************************************************************************
@@ -189,9 +192,9 @@ void RS485_Transmitter_Enable(bool enable)
* NOTES: none
*****************************************************************************/
void RS485_Send_Data(
uint8_t * buffer, /* data to send */
uint16_t nbytes) /* number of bytes of data */
{
uint8_t * buffer, /* data to send */
uint16_t nbytes)
{ /* number of bytes of data */
/* LED on send */
volatile AT91PS_PIO pPIO = AT91C_BASE_PIOA;
/* LED ON */
@@ -218,7 +221,8 @@ void RS485_Send_Data(
* ALGORITHM: none
* NOTES: Clears any error flags.
*****************************************************************************/
bool RS485_ReceiveError(void)
bool RS485_ReceiveError(
void)
{
bool ReceiveError = false;
/* LED on send */
@@ -242,25 +246,27 @@ bool RS485_ReceiveError(void)
* ALGORITHM: none
* NOTES: none
*****************************************************************************/
bool RS485_DataAvailable(uint8_t *DataRegister)
bool RS485_DataAvailable(
uint8_t * DataRegister)
{
bool DataAvailable = false;
/* LED on send */
volatile AT91PS_PIO pPIO = AT91C_BASE_PIOA;
if ( RS485_Interface->US_CSR & AT91C_US_RXRDY) {
if (RS485_Interface->US_CSR & AT91C_US_RXRDY) {
/* data is available */
*DataRegister = RS485_Interface->US_RHR;
DataAvailable = true;
/* LED ON */
pPIO->PIO_CODR = LED2;
}
return DataAvailable;
}
#ifdef TEST_RS485
int main(void)
int main(
void)
{
unsigned i = 0;
uint8_t DataRegister;
@@ -270,11 +276,10 @@ int main(void)
/* receive task */
for (;;) {
if (RS485_ReceiveError()) {
fprintf(stderr,"ERROR ");
fprintf(stderr, "ERROR ");
} else if (RS485_DataAvailable(&DataRegister)) {
fprintf(stderr,"%02X ",DataRegister);
fprintf(stderr, "%02X ", DataRegister);
}
}
}
#endif
#endif